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Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions | May 31, 2024 | May 31, 2023
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Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses | $ (23.0) | $ (15.2)
Securities in an unrealized loss position for less than twelve months, Fair value | 1,068.9 | 992.5
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (141.2) | (164.2)
Securities in an unrealized loss position for more than twelve months, Fair value | 2,102.7 | 1,752.9
Total, Gross unrealized losses | (164.2) | (179.4)
Total, Fair value | 3,171.6 | 2,745.4
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses | (0.4) | (0.1)
Securities in an unrealized loss position for less than twelve months, Fair value | 77.4 | 54.2
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (0.7) | (1.3)
Securities in an unrealized loss position for more than twelve months, Fair value | 43.0 | 23.3
Total, Gross unrealized losses | (1.1) | (1.4)
Total, Fair value | 120.4 | 77.5
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses | (8.4) | (5.9)
Securities in an unrealized loss position for less than twelve months, Fair value | 620.8 | 652.0
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (24.4) | (25.2)
Securities in an unrealized loss position for more than twelve months, Fair value | 647.8 | 382.7
Total, Gross unrealized losses | (32.8) | (31.1)
Total, Fair value | 1,268.6 | 1,034.7
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses | (8.0) | (5.9)
Securities in an unrealized loss position for less than twelve months, Fair value | 102.5 | 86.7
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (78.9) | (99.4)
Securities in an unrealized loss position for more than twelve months, Fair value | 864.7 | 889.0
Total, Gross unrealized losses | (86.9) | (105.3)
Total, Fair value | 967.2 | 975.7
U.S. Government Agency And Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses | (6.2) | (3.3)
Securities in an unrealized loss position for less than twelve months, Fair value | 268.2 | 199.6
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (37.2) | (38.3)
Securities in an unrealized loss position for more than twelve months, Fair value | 547.2 | 457.9
Total, Gross unrealized losses | (43.4) | (41.6)
Total, Fair value | $ 815.4 | $ 657.5

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